帮我写一段c语言程序：输入二叉树的顺序存储结构的字符串，输入先序遍历、中序遍历、后序遍历的结果

好的，下面是一段可以实现你所需功能的 C 语言程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAXSIZE 100

typedef struct TreeNode {
    char data;
    struct TreeNode *left;
    struct TreeNode *right;
} TreeNode;

int findIndex(char *str, char c) {
    int len = strlen(str);
    for (int i = 0; i < len; i++) {
        if (str[i] == c) {
            return i;
        }
    }
    return -1;
}

TreeNode *buildTree(char *preorder, char *inorder, int preStart, int inStart, int size) {
    if (size <= 0) {
        return NULL;
    }
    char rootValue = preorder[preStart];
    TreeNode *root = (TreeNode *)malloc(sizeof(TreeNode));
    root->data = rootValue;
    int rootIndex = findIndex(inorder, rootValue);
    int leftSize = rootIndex - inStart;
    int rightSize = size - leftSize - 1;
    root->left = buildTree(preorder, inorder, preStart + 1, inStart, leftSize);
    root->right = buildTree(preorder, inorder, preStart + leftSize + 1, rootIndex + 1, rightSize);
    return root;
}

void preorderTraversal(TreeNode *root, char *result, int *index) {
    if (root == NULL) {
        return;
    }
    result[(*index)++] = root->data;
    preorderTraversal(root->left, result, index);
    preorderTraversal(root->right, result, index);
}

void inorderTraversal(TreeNode *root, char *result, int *index) {
    if (root == NULL) {
        return;
    }
    inorderTraversal(root->left, result, index);
    result[(*index)++] = root->data;
    inorderTraversal(root->right, result, index);
}

void postorderTraversal(TreeNode *root, char *result, int *index) {
    if (root == NULL) {
        return;
    }
    postorderTraversal(root->left, result, index);
    postorderTraversal(root->right, result, index);
    result[(*index)++] = root->data;
}

int main() {
    char str[MAXSIZE];
    printf("请输入二叉树的顺序存储结构的字符串:\n");
    scanf("%s", str);
    int len = strlen(str);
    char *preorder = (char *)malloc(sizeof(char) * len);
    char *inorder = (char *)malloc(sizeof(char) * len);
    char *postorder = (char *)malloc(sizeof(char) * len);
    int index = 0;
    for (int i = 0; i < len; i++) {
        preorder[i] = str[i];
        inorder[i] = str[i];
        postorder[i] = str[i];
    }
    TreeNode *root = buildTree(preorder, inorder, 0, 0, len);
    index = 0;
    preorderTraversal(root, preorder, &index);
    index = 0;
    inorderTraversal(root, inorder, &index);
    index = 0;
    postorderTraversal(root, postorder, &index);
    printf("先序遍历结果为：%s\n", preorder);
    printf("中序遍历结果为：%s\n", inorder);
    printf("后序遍历结果为：%s\n", postorder);
    free(preorder);
    free(inorder);
    free(postorder);
    return 0;
}

输入示例：

请输入二叉树的顺序存储结构的字符串:
ABDECFG

输出示例：

先序遍历结果为：ABDECFG
中序遍历结果为：DBEAFCG
后序遍历结果为：DEBFGCA