diff --git a/c_modern_approach/Strings/exercises/exc_04.c b/c_modern_approach/Strings/exercises/exc_04.c
new file mode 100644
index 0000000..f49fb6c
--- /dev/null
+++ b/c_modern_approach/Strings/exercises/exc_04.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_REMIND 50
+#define MSG_LEN 60
+
+int read_line(char str[], int n);
+int main(void) {
+  char reminders[MAX_REMIND][MSG_LEN + 3];
+  char day_str[3], msg_str[MSG_LEN + 1];
+  int day, i, j, num_remind = 0;
+  for (;;) {
+    if (num_remind == MAX_REMIND) {
+      printf("-- No space left --\n");
+      break;
+    }
+    printf("Enter day and reminder: ");
+    scanf("%2d", &day);
+    if (day == 0)
+      break;
+    sprintf(day_str, "%2d", day);
+    read_line(msg_str, MSG_LEN);
+    for (i = 0; i < num_remind; i++)
+      if (strcmp(day_str, reminders[i]) < 0)
+        break;
+    for (j = num_remind; j > i; j--)
+      strcpy(reminders[j], reminders[j - 1]);
+    strcpy(reminders[i], day_str);
+    strcat(reminders[i], msg_str);
+    num_remind++;
+  }
+  printf("\nDay Reminder\n");
+  for (i = 0; i < num_remind; i++)
+    printf(" %s\n", reminders[i]);
+  return 0;
+}
+
+int read_line(char str[], int n) {
+  int ch, i = 0;
+
+  while ((ch = getchar()) != '\n') {
+    if (i < n) {
+      str[i++] = ch;
+    }
+  }
+  str[i] = '\0';
+  return i;
+}
diff --git a/c_modern_approach/Strings/exercises/exc_05A.c b/c_modern_approach/Strings/exercises/exc_05A.c
new file mode 100644
index 0000000..ac97f15
--- /dev/null
+++ b/c_modern_approach/Strings/exercises/exc_05A.c
@@ -0,0 +1,23 @@
+#include <ctype.h>
+#include <stdio.h>
+#define MAX_REMIND 50
+#define MSG_LEN 60
+
+char *capitalize(char cap_string[]);
+
+int main() {
+  char string_to_capitalize[] = "some fuck1ng bullshit!";
+  char *cap;
+  cap = capitalize(string_to_capitalize);
+  printf("%s", cap);
+}
+
+char *capitalize(char cap_string[]) {
+  char *p;
+  char capitalized_string[MSG_LEN];
+  p = capitalized_string;
+  for (int i = 0; cap_string[i] != '\0'; i++) {
+    capitalized_string[i] = toupper(cap_string[i]);
+  }
+  return p;
+}
diff --git a/c_modern_approach/Strings/exercises/exc_05B.c b/c_modern_approach/Strings/exercises/exc_05B.c
new file mode 100644
index 0000000..6402da0
--- /dev/null
+++ b/c_modern_approach/Strings/exercises/exc_05B.c
@@ -0,0 +1,26 @@
+#include <ctype.h>
+#include <stdio.h>
+#define MAX_REMIND 50
+#define MSG_LEN 60
+
+char *capitalize(char cap_string[]);
+
+int main() {
+  char string_to_capitalize[] = "some fuck1ng bullshit!";
+  char *cap;
+  cap = capitalize(string_to_capitalize);
+  printf("%s", cap);
+}
+
+char *capitalize(char cap_string[]) {
+  char *p;
+  char capitalized_string[MSG_LEN];
+  int i = 0;
+  p = capitalized_string;
+  while (*cap_string) {
+    capitalized_string[i] = toupper(*cap_string);
+    i++;
+    cap_string++;
+  }
+  return p;
+}
diff --git a/c_modern_approach/Strings/exercises/exc_06.c b/c_modern_approach/Strings/exercises/exc_06.c
new file mode 100644
index 0000000..d8f49c5
--- /dev/null
+++ b/c_modern_approach/Strings/exercises/exc_06.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#define MAX_LEN 60
+char *censor(char cens_string[]);
+
+int main() {
+  char string_to_censor[MAX_LEN] = "Hello my dear foolish foles!";
+  char *cens;
+  cens = censor(string_to_censor);
+  printf("INPUT:\t %s\n", string_to_censor);
+  printf("OUTPUT:\t %s\n", cens);
+}
+
+char *censor(char cens_string[]) {
+  char to_cens[] = "foo";
+  char cens_char = 'x';
+  char censored[MAX_LEN + 1], *c, *start;
+  c = censored;
+  start = c;
+  int i = 0;
+  // Starting iteration on string to censor
+  while (*cens_string) {
+    // If we find 'f' char - we need to check current 'f' char and next 2 for
+    // equality with to_cens string
+    if (*cens_string == to_cens[0] && *(cens_string + 1) == to_cens[1] &&
+        *(cens_string + 2) == to_cens[2]) {
+      *c = cens_char;
+      *(c + 1) = cens_char;
+      *(c + 2) = cens_char;
+      cens_string += 3;
+      c += 3;
+    } else {
+      *c++ = *cens_string++;
+    }
+  }
+  return start;
+}