Reverse a String In-Place

#include <stdio.h>

int custom_strlen(const char *str) {
    // Your logic here
    int length = 0;
    while(str[length] != '\0'){
        length++;
    }
    return length;
}

void reverse_string(char *str) {
    // Your logic here
    char *i = str;
    char *j = str + custom_strlen(str) - 1;
    while(i < j){
        int temp = *i;
        *i = *j;
        *j = temp;
        i++;
        j--;
    }
}

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;
}