Convert String to Integer

Code

#include <stdio.h>
#include <stdint.h>
#include<string.h>
int custom_atoi(const char *str) {
    int n=strlen(str);
    int i=0,sign=1,val=0;
    while(str[i]==' ')
    i++;
    if(str[i]=='+'||str[i]=='-'){
        if(str[i]=='-'){
            sign=-1;
            
        }
        i++;
    }
    while(str[i]>='0'&&str[i]<='9'){
        val=val*10+str[i]-'0';
        i++;
    }
    return sign*val;
}

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

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    printf("%d", custom_atoi(str));
    return 0;
}

Solving Approach