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include include include define MAX 1000 char textStack[MAX];int top = -1; char undoStack[MAX];int undoTop = -1; // Push character to text stackvoid typeChar(char ch) {if (top < MAX – 1) {textStack[++top] = ch;undoStack[++undoTop] = ch; // Save to undo stack} else {printf(“Text stack full!\n”);}} // Undo last charactervoid undo() {if (undoTop >= 0) {top–; // … Read more