Summarize and paste values in second line of same row

Question

I am trying to summarise the rows and paste the values in the second line but in the same row. I tried with following code but not getting the result. Can anyone help me

df1 <- data.frame(a = c("xyz","xyz"), b = c("C1 : 2", "C2 : 3"), c = c(2,2))
df1 %>% group_by(a) %>% summarise(years = cat(paste(b), sep="\n"))
C1 : 2
C2 : 3

Expected output

    a     years 
  xyz    C1 : 2 
         C2 : 3 

Answer 1

Another potential solution is to remove the values in the a column that you don't want, e.g.

library(tidyverse)
df1 <- data.frame(a = c("xyz","xyz"), b = c("C1 : 2", "C2 : 3"), c = c(2,2))
df2 <- df1 %>%
  group_by(a) %>%
  summarise(years = b)

df2[2,1] <- ""
as.data.frame(df2)
#    a  years
#1 xyz C1 : 2
#2     C2 : 3