Why newline character isn't printed.

[DuilioPerez]

I'm learning to use notcurses by my own way. I've created a program to transcribe DNA into RNA. Here is the code

#include <notcurses/notcurses.h>
#include <string>
using namespace std;

bool verify(int c, string &dna)
{
  if (c == 'a' || c == 'A' || c == 'g' || c == 'G' ||
      c == 'u' || c == 'U' || c == 'c' || c == 'C' ||
      c == 't' ||
      c == 'T') // Includes 't' and 'T' in valid characters
  {
    dna += static_cast<char>(c);
    return true;
  }
  return false;
}

string rna(const string &dna)
{
  string rna;
  for (char c : dna)
  {
    if (c == 't' || c == 'T')
      rna += 'u';
    else
      rna += c;
  }
  return rna;
}

int main()
{
  string            dna;
  int               c;
  notcurses_options options = {};
  notcurses        *app = notcurses_init(&options, stdout);
  if (!app)
  {
    fprintf(stderr, "Error initializing Notcurses\n");
    return 1;
  }
  ncplane *stdplane = notcurses_stdplane(app);

  // Clear screen at start
  ncplane_erase(stdplane);
  ncplane_putstr(stdplane, "Enter the DNA code (press 'q' to quit):");
  notcurses_render(app);

  while ((c = notcurses_get_blocking(app, nullptr)) != 'q')
  {
    if (verify(c, dna))
    {
      ncplane_putchar(stdplane, static_cast<char>(c));
      notcurses_render(app);
    }
  }

  ncplane_putstr(stdplane, "\nTranscribed RNA: ");
  notcurses_render(app);
  ncplane_putstr(stdplane, rna(dna).c_str());
  notcurses_render(app);

  // Wait for user to press 'q' to exit
  while (notcurses_get_blocking(app, nullptr) != 'q')
    ;

  notcurses_stop(app);
  return 0;
}

When I add a newline to the beginning of a string, it doesn't print using ncplane_putstr, or when I do something like ncplane_putchar(stdplane, '\n') it doesn't work. I'm using Termux to program.