From the lecture video and reference.cs50.net I have learnt to use get_string(void) this method but It don't work in cs50 IDE. Instead of get_string(void), GetString() method is working in my IDE.

getMethod.c

#include <cs50.h>
#include <stdio.h>

int main(void){
    
    printf("type char:");
    printf("This is char %c\n\n", GetChar());
    
    printf("type double:");
    printf("This is double %f\n\n", GetDouble());
    
    printf("type float:");
    printf("This is float %1.5f\n\n", GetFloat());
    
    printf("type int:");
    printf("This is int %i\n\n", GetInt());
    
    printf("type long long:");
    printf("This is long long %lld\n\n", GetLongLong());
    
    printf("type string:");
    printf("This is string %s\n\n", GetString());
    
}

getMethod2.c

#include <cs50.h>
#include <stdio.h>

int main(void){
    
    printf("type char:");
    printf("This is char %c\n\n", get_char(void));
    
    printf("type double:");
    printf("This is double %f\n\n", get_double(void));
    
    printf("type float:");
    printf("This is float %1.5f\n\n", get_float(void));
    
    printf("type int:");
    printf("This is int %i\n\n", get_int(void));
    
    printf("type long long:");
    printf("This is long long %lld\n\n", get_long_long(void));
    
    printf("type string:");
    printf("This is string %s\n\n", get_string(void));
    
}