如果在 R 中用特殊字符(如+号)分隔，则为数据框中的项目创建新行

I have a data in text file which contain several column, I would like to process data in such a way that I should not loose any information, some coulmn include two or more information seperated with special character such as "+" plus sign, I would like to put this combined information in differnt row within same column, for example I pasted data below here
My dataframe look like following

df <- data.frame(G1=c("GH13_22+CBM4",  "GH109+PL7+GH9","GT57", "AA3","",""),
                 G2=c("GH13_22","","GT57+GH15","AA3", "GT41","PL+PL2"),
                 G3=c("GH13", "GH1O9","", "CBM34+GH13+CBM48", "GT41","GH16+CBM4+CBM54+CBM32"))

             G1        G2                    G3
1  GH13_22+CBM4   GH13_22                  GH13
2 GH109+PL7+GH9                           GH1O9
3          GT57 GT57+GH15
4           AA3       AA3      CBM34+GH13+CBM48
5                    GT41                  GT41
6                  PL+PL2 GH16+CBM4+CBM54+CBM32

预期结果应如下所示

df2 <- data.frame(G1=c("GH13_22","CBM4",  "GH109","PL7","GH9","GT57", "AA3","","","",""),
                  G2=c("GH13_22","","GT57","GH15","AA3", "GT41","PL","PL2","","",""),
                  G3=c("GH13", "GH1O9","", "CBM34","GH13","CBM48", "GT41","GH16","CBM4","CBM54","CBM32")) 

        G1      G2    G3
1  GH13_22 GH13_22  GH13
2     CBM4         GH1O9
3    GH109    GT57
4      PL7    GH15 CBM34
5      GH9     AA3  GH13
6     GT57    GT41 CBM48
7      AA3      PL  GT41
8              PL2  GH16
9                   CBM4
10                 CBM54
11                 CBM32

感谢您的任何帮助 谢谢