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Explore Stack InternalThanks to ceilingcat for -2324 bytes
#define P strcpy(f+d,index("!?.",i[c-2])+!c? c;d;v(char*ii,int*gg,char*ff)char*i,*g,*f;{for(d=0;i[c];c++,d++)strcmp("[?]",memcpy(g,i+c,3))?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an "),d++:P"A ":"a "),d++,c+=3);} Thanks to ceilingcat for -23 bytes
#define P strcpy(f+d,index("!?.",i[c-2])+!c? c;d;v(char*i,int*g,char*f){for(d=0;i[c];c++,d++)strcmp("[?]",memcpy(g,i+c,3))?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an "),d++:P"A ":"a "),d++,c+=3);} Thanks to ceilingcat for -24 bytes
#define P strcpy(f+d,index("!?.",i[c-2])+!c? c;d;v(i,g,f)char*i,*g,*f;{for(d=0;i[c];c++,d++)strcmp("[?]",memcpy(g,i+c,3))?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an "),d++:P"A ":"a "),d++,c+=3);} Thanks to ceilingcat for -1823 bytes
#define P strncpystrcpy(f+d,index("!?.",i[c-2])+!c? c;d;v(char*i,int*g,char*f){for(d=0;i[c];c++,d++)strcmp("[?]",memcpy(g,i+c,3))?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an ",3),d++:P"A ":"a ",2),d++,c+=3);} Thanks to ceilingcat for -18 bytes
#define P strncpy(f+d,index("!?.",i[c-2])+!c? c;d;v(char*i,int*g,char*f){for(d=0;i[c];c++,d++)strcmp("[?]",memcpy(g,i+c,3))?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an ",3),d++:P"A ":"a ",2),d++,c+=3);} Thanks to ceilingcat for -23 bytes
#define P strcpy(f+d,index("!?.",i[c-2])+!c? c;d;v(char*i,int*g,char*f){for(d=0;i[c];c++,d++)strcmp("[?]",memcpy(g,i+c,3))?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an "),d++:P"A ":"a "),d++,c+=3);} Thanks to ceilingcat for -18 bytes
#define P strncpy(f+d,strchrindex("!?.",i[c-2])+!c? vc;d;v(char*i,int*g,char*f){for(int c,d=0;i[c];c++,d++){memcpy(g,i+c,3);if(!strcmp("[?]",memcpy(g,i+c,3)){strchr?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an ",3),d++:P"A ":"a ",2),d++;c+=3;}else{f[d]=i[c];}}d++,c+=3);} more readable:
#define P strncpy(f+d,strchr("!?.",i[c-2])+!c? v(char*i,int*g,char*f){for(int c,d=0;i[c];c++,d++){memcpy(g,i+c,3);if(!strcmp("[?]",g)){strchr("aeiouAEIOU",i[c+4])?P"An ":"an ",3),d++:P"A ":"a ",2),d++;c+=3;}else{f[d]=i[c];}}} more readable:
Thanks to ceilingcat for -18 bytes
#define P strncpy(f+d,index("!?.",i[c-2])+!c? c;d;v(char*i,int*g,char*f){for(d=0;i[c];c++,d++)strcmp("[?]",memcpy(g,i+c,3))?f[d]=i[c]:(index("aeiouAEIOU",i[c+4])?P"An ":"an ",3),d++:P"A ":"a ",2),d++,c+=3);}