runtime error: null pointer passed as argument 1, which is declared to never be null [solution.c]

今天力扣报错runtime error: null pointer passed as argument 1, which is declared to never be null [solution.c]
拿c语言写的，发现是因为忘记malloc

给个题看看：
https://leetcode-cn.com/problems/complex-number-multiplication/solution/sscanf-he-sprintfke-yi-jie-jue-yi-qie-we-ccob/

就是因为这行char* ans=(char*)malloc(sizeof(char*)*100000);

char * complexNumberMultiply(char * num1, char * num2){int a1,b1,a2,b2;sscanf(num1,"%d+%di",&a1,&b1);sscanf(num2,"%d+%di",&a2,&b2);int x1=a1*a2-b1*b2;int x2=a1*b2+a2*b1;char* ans=(char*)malloc(sizeof(char*)*100000);sprintf(ans,"%d+%di",x1,x2);return ans;
}

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runtime error: null pointer passed as argument 1, which is declared to never be null [solution.c]

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