Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    int l = 0;
    while (str[l] != '\0')
        l++;

    l--;

    int i = 0;
    while (i <= l - 1) {
        char t = str[i];
        str[i] = str[l];
        str[l] = t;
        l--;
        i++;
    }
    
}

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