Reverse a String In-Place

Code

#include <stdio.h>
#include <stdint.h>

void my_strlen(char *str, uint16_t *length) {
    *length = 0 ;
    while (*str != '\0') {
        (*length)++; ; 
         str++;
    }

}
void reverse_string(char *str) {
    uint16_t length , temp =0 ;
    my_strlen(str,&length);
   char *start = str ;
   char *end = str + (length-1);
   while(start < end)
   {
      temp = *start ;
      *start = *end ;
      *end = temp;
      start++;
      end-- ;
   }

}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    int i = 0;
    while (str[i] != '\0') {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    reverse_string(str);
    printf("%s", str);
    return 0;
}

Solving Approach