Can anyone explain me why this happens when you declare this in C-

char *string = malloc(sizeof(char));

this should technically create a string of size 1;
but it doesn't,
this is able to store strings upto 30+ characters somehow, why is this happening /where am I wrong?

test gives out triangles like (12, 47, 21)

just google for "ASCII character code", for example 'A' has ASCII value of 65.